Sandra is showing her work in simplifying (3.3 - 4.2) - 2.8 + 5.7 identify any error in her work or reasoning
There is no error in Sandra's work. The expression (3.3 - 4.2) - 2.8 + 5.7 can be simplified as follows:
(3.3 - 4.2) - 2.8 + 5.7
= -0.9 - 2.8 + 5.7
= -3.7 + 5.7
= 2
Therefore, Sandra's work is correct.
Let's simplify the expression (3.3 - 4.2) - 2.8 + 5.7 step by step:
Step 1: Calculate the expression inside the first parentheses: (3.3 - 4.2)
3.3 - 4.2 = -0.9
Step 2: Replace the expression with the simplified value: -0.9 - 2.8 + 5.7
Step 3: Calculate the expression inside the second parentheses: -0.9 - 2.8
-0.9 - 2.8 = -3.7
Step 4: Replace the expression with the simplified value: -3.7 + 5.7
Step 5: Calculate the final expression: -3.7 + 5.7 = 2
In the given expression, (3.3 - 4.2) - 2.8 + 5.7, there doesn't seem to be any error in the calculation or reasoning provided by Sandra. The simplified value is 2.